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WAEC Mathematics 2019 Question 3

Question 3

Linear and Simultaneous Equations

Solve: (y + 1)/2 − (2y − 1)/3 = 4.

  1. A.y = 19
  2. B.y = −19
  3. C.y = −29
  4. D.y = 29
Show the answer and explanation

Answer: B (y = −19)

Explanation

Multiply by 6: 3(y + 1) − 2(2y − 1) = 24, so 3y + 3 − 4y + 2 = 24, giving −y = 19 and y = −19.